Circuit Breaker Objective Type Questions and answers

21.  In a circuit breaker the active recovery voltage depends upon

   A. Circuit conditions

   B. Power factor

   C. Armature reaction

   D. All of the above

22.  The making to breaking current ratio for an EHV circuit breaker is

   A. More than 1

   B. Equal to 1

   C. Less than 1

   D. A negative number

23.  The making capacity of a circuit breaker is

   A. Less than the asymmetrical breaking capacity of the breaker

   B. Greater than the asymmetrical breaking capacity of the breaker

   C. Equal to the symmetrical breaking capacity of the breaker

   D. Equal to the asymmetrical breaking capacity

24.  The probable cause(s) for failure of a circuit breaker on electrical compound could be

   A. Trip circuit open

   B. Trip latch defective

   C. Spring defective

   D. Any of the above

25.  Routine tests are conducted on

   A. Bulk oil circuit breakers

   B. Minimum oil circuit breakers

   C. Air-blast circuit breakers

   D. All of the above

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